All tetrapodes , mammals , birds , reptiles and amphibians .
Mammal
Yes, they are one of the classes of vertebrate.
yes
fish represent three of several classes that make up the phylum of vertebrate
what two classes of vertebrates use external fertilisation
Generally speaking, "beast" is simply another word for "animal" with four legs. It can be a vertebrate or an invertebrate. All animals are beasts. So, yes, an elephant is a beast.
A tetrapod is a vertebrate animal with four limbs. "Tetra" means "four" and "pod" means "foot". Amphibians, reptiles, birds and mammals are all tetrapods; even snakes and other limbless reptiles and amphibians are tetrapods because they descended from animals which had four limbs. Whales and other cetaceans are also tetrapods because they are mammals have two front limbs and the two hind limbs are vestiges.
The answer is a bed. A bed has four legs, it sits on the floor with its legs, and "waits" for someone's legs to come and lie down on it.
-Name a vertebrate that has a 4-chambered heart -A hummingbird would be one good example of a vertebrate that has a four chambered heart.
mice have 4 legs :) look on google at pictures of them :p
4 legs
A lion has four legs.